Abstract
A new procedure for the material characterization of rubber blends is proposed. It is based on a generalized Newton-Raphson procedure. Such a model has to consider the effect of wall slippage on the viscous properties as well as the non-linear coupling of the viscosity and shear strain rate, which is typical for rubber blends and polymers, respectively. The main goal of this method is the reduction of the experimental effort for determination of the viscosity function. Application of the new method is shown for four rubber materials. An experimental investigation of the viscous properties of rubber blends by means of capillary-viscometry serves as the basis of the work. Because of the pseudo-plastic material behavior of the proposed material, characterization is represented by a coupled system of non-linear equations. Describing their solution requires a numerical integration algorithm. Verification of the developed method for parameter identification was done by comparison of the obtained viscosity curves and the respective velocity profiles in capillary dies with the one obtained by the commonly used material characterization based on correction methods.
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